diff --git a/tools/hwlab-cli/client.test.ts b/tools/hwlab-cli/client.test.ts
index f5da56b0..9770ea87 100644
--- a/tools/hwlab-cli/client.test.ts
+++ b/tools/hwlab-cli/client.test.ts
@@ -1262,6 +1262,44 @@ test("hwlab-cli agent composer status detects Web unlocked steer mode", async ()
   assert.equal(result.payload.route.path, "/v1/agent/chat/steer");
 });
 
+test("hwlab-cli agent composer status ignores stale workspace activeTrace after selected conversation completed", async () => {
+  const result = await runHwlabCli([
+    "client",
+    "agent",
+    "composer",
+    "status",
+    "--base-url",
+    "http://web.test",
+    "--cookie",
+    "hwlab_session=session-a"
+  ], {
+    fetchImpl: async () => new Response(JSON.stringify({
+      ok: true,
+      workspace: {
+        workspaceId: "wsp_composer",
+        revision: 10,
+        selectedConversationId: "cnv_completed",
+        selectedAgentSessionId: "ses_completed",
+        activeTraceId: "trc_stale_running",
+        workspace: {
+          activeTraceId: "trc_stale_running",
+          threadId: "thread-composer",
+          sessionStatus: "running",
+          messages: [{ role: "agent", status: "completed", traceId: "trc_completed", conversationId: "cnv_completed" }]
+        }
+      }
+    }), { status: 200 })
+  });
+
+  assert.equal(result.exitCode, 0);
+  assert.equal(result.payload.composer.locked, false);
+  assert.equal(result.payload.composer.disabled, false);
+  assert.equal(result.payload.composer.submitMode, "turn");
+  assert.equal(result.payload.composer.route, "/v1/agent/chat");
+  assert.equal(result.payload.composer.targetTraceId, null);
+  assert.equal(result.payload.composer.reason, "terminal-turn");
+});
+
 test("hwlab-cli agent composer submit auto routes active Web turn to steer", async () => {
   const calls: any[] = [];
   const result = await runHwlabCli([
diff --git a/tools/src/hwlab-cli/composer-policy.ts b/tools/src/hwlab-cli/composer-policy.ts
index 25f5a194..8744f011 100644
--- a/tools/src/hwlab-cli/composer-policy.ts
+++ b/tools/src/hwlab-cli/composer-policy.ts
@@ -8,6 +8,8 @@ export function computeCodeAgentComposerState(input = {}) {
   const current = input.currentRequest && typeof input.currentRequest === "object" ? input.currentRequest : null;
   const workspace = input.workspace && typeof input.workspace === "object" ? input.workspace : null;
   const explicitStatus = normalizedStatus(input.status ?? input.sessionStatus ?? workspace?.sessionStatus);
+  const latestStatus = normalizedStatus(latest?.status);
+  const effectiveStatus = latestStatus || explicitStatus;
   const traceId = firstNonEmptyString(
     input.targetTraceId,
     current?.traceId,
@@ -15,7 +17,7 @@ export function computeCodeAgentComposerState(input = {}) {
     workspace?.activeTraceId,
     latest?.status === "running" ? latest?.traceId : null
   );
-  const active = Boolean(traceId) && (
+  const active = Boolean(traceId) && !terminalStatus(effectiveStatus) && (
     activeStatus(current?.status) ||
     activeStatus(latest?.status) ||
     activeStatus(explicitStatus) ||
@@ -51,7 +53,7 @@ export function computeCodeAgentComposerState(input = {}) {
     threadId: firstNonEmptyString(input.threadId, current?.threadId, latest?.threadId, workspace?.threadId),
     workspaceId: firstNonEmptyString(input.workspaceId, workspace?.workspaceId),
     workspaceRevision: integerOrNull(input.workspaceRevision ?? workspace?.revision),
-    reason: active ? "active-turn-steer" : disabledReason ?? (terminalStatus(explicitStatus) ? "terminal-turn" : "idle-turn")
+    reason: active ? "active-turn-steer" : disabledReason ?? (terminalStatus(effectiveStatus) ? "terminal-turn" : "idle-turn")
   });
 }
 
diff --git a/web/hwlab-cloud-web/src/App.tsx b/web/hwlab-cloud-web/src/App.tsx
index 0e1ae2c4..f7c7587a 100644
--- a/web/hwlab-cloud-web/src/App.tsx
+++ b/web/hwlab-cloud-web/src/App.tsx
@@ -139,7 +139,7 @@ export function App(): ReactElement {
         {route === "help" ? <HelpView help={help} /> : null}
         {route === "settings" ? <SettingsView onLogout={auth.logout} /> : null}
         <DraftsList onPick={pickDraft} />
-        <CommandBar disabled={store.composer.disabled} providerProfile={store.state.providerProfile} codeAgentTimeoutMs={store.state.codeAgentTimeoutMs} gatewayShellTimeoutMs={store.state.gatewayShellTimeoutMs} onProviderProfile={store.setProviderProfile} onCodeAgentTimeout={store.setCodeAgentTimeoutMs} onGatewayShellTimeout={store.setGatewayShellTimeoutMs} onSubmit={submitWithDraftRecord} onClear={store.clearConversation} pickedDraft={pickedDraft} onPickedDraftConsumed={clearPickedDraft} disabledReason={store.composer.disabledReason} onTyping={noteActivity} />
+        <CommandBar key={store.activeConversationId ?? "default"} disabled={store.composer.disabled} submitMode={store.composer.submitMode} targetTraceId={store.composer.targetTraceId} providerProfile={store.state.providerProfile} codeAgentTimeoutMs={store.state.codeAgentTimeoutMs} gatewayShellTimeoutMs={store.state.gatewayShellTimeoutMs} onProviderProfile={store.setProviderProfile} onCodeAgentTimeout={store.setCodeAgentTimeoutMs} onGatewayShellTimeout={store.setGatewayShellTimeoutMs} onSubmit={submitWithDraftRecord} onClear={store.clearConversation} pickedDraft={pickedDraft} onPickedDraftConsumed={clearPickedDraft} disabledReason={store.composer.disabledReason} onTyping={noteActivity} />
       </section>
       <div
         className="resize-handle right-sidebar-resize"
diff --git a/web/hwlab-cloud-web/src/components/command-bar/CommandBar.test.ts b/web/hwlab-cloud-web/src/components/command-bar/CommandBar.test.ts
new file mode 100644
index 00000000..301f8c11
--- /dev/null
+++ b/web/hwlab-cloud-web/src/components/command-bar/CommandBar.test.ts
@@ -0,0 +1,15 @@
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { test } from "bun:test";
+
+const sourcePath = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "CommandBar.tsx");
+
+test("CommandBar releases the send lock on the next tick instead of waiting for the full agent turn", () => {
+  const source = fs.readFileSync(sourcePath, "utf8");
+  assert.match(source, /const submitted = props\.onSubmit\(next\);/u);
+  assert.match(source, /window\.setTimeout\(\(\) => setSubmitting\(false\), 0\);/u);
+  assert.doesNotMatch(source, /await props\.onSubmit\(next\)/u);
+  assert.doesNotMatch(source, /\.finally\(\(\) => setSubmitting\(false\)\)/u);
+});
diff --git a/web/hwlab-cloud-web/src/components/command-bar/CommandBar.tsx b/web/hwlab-cloud-web/src/components/command-bar/CommandBar.tsx
index 1b8becd0..10115f20 100644
--- a/web/hwlab-cloud-web/src/components/command-bar/CommandBar.tsx
+++ b/web/hwlab-cloud-web/src/components/command-bar/CommandBar.tsx
@@ -5,6 +5,8 @@ import type { ProviderProfile } from "../../types/domain";
 
 interface CommandBarProps {
   disabled: boolean;
+  submitMode: "turn" | "steer";
+  targetTraceId: string | null;
   providerProfile: ProviderProfile;
   codeAgentTimeoutMs: number;
   gatewayShellTimeoutMs: number;
@@ -29,7 +31,7 @@ interface CommandBarProps {
 
 export function CommandBar({ pickedDraft, onPickedDraftConsumed, disabledReason, onTyping, ...props }: CommandBarProps): ReactElement {
   const [value, setValue] = useState("");
-  const [pending, setPending] = useState(false);
+  const [submitting, setSubmitting] = useState(false);
 
   useEffect(() => {
     if (pickedDraft) {
@@ -41,14 +43,12 @@ export function CommandBar({ pickedDraft, onPickedDraftConsumed, disabledReason,
   async function submit(event: FormEvent<HTMLFormElement>): Promise<void> {
     event.preventDefault();
     const next = value.trim();
-    if (!next || props.disabled || pending) return;
-    setPending(true);
-    try {
-      await props.onSubmit(next);
-      setValue("");
-    } finally {
-      setPending(false);
-    }
+    if (!next || props.disabled || submitting) return;
+    setValue("");
+    setSubmitting(true);
+    const submitted = props.onSubmit(next);
+    window.setTimeout(() => setSubmitting(false), 0);
+    void submitted.catch(() => setSubmitting(false));
   }
 
   function keyDown(event: KeyboardEvent<HTMLTextAreaElement>): void {
@@ -58,7 +58,7 @@ export function CommandBar({ pickedDraft, onPickedDraftConsumed, disabledReason,
   }
 
   return (
-    <form className="command-bar" id="command-form" aria-label="Agent 输入" onSubmit={submit} title={disabledReason ?? undefined}>
+    <form className="command-bar" id="command-form" aria-label="Agent 输入" onSubmit={submit} title={disabledReason ?? steerTitle(props.submitMode, props.targetTraceId)}>
       <label className="agent-timeout-control" htmlFor="code-agent-provider-profile">
         <span>模型通道</span>
         <select id="code-agent-provider-profile" aria-label="Code Agent 模型通道" value={props.providerProfile} onChange={(event) => props.onProviderProfile(event.currentTarget.value as ProviderProfile)}>
@@ -93,8 +93,18 @@ export function CommandBar({ pickedDraft, onPickedDraftConsumed, disabledReason,
         <span className="prompt-mark">hwlab</span>
         <textarea id="command-input" value={value} placeholder="输入任务，Enter 发送，Shift+Enter 换行" rows={1} onChange={(event) => { setValue(event.currentTarget.value); onTyping(); }} onKeyDown={keyDown} />
       </div>
-      <button className="command-button" id="command-send" type="submit" disabled={props.disabled || pending}>{pending ? "发送中" : "发送"}</button>
+      <button className="command-button" id="command-send" type="submit" disabled={props.disabled || submitting}>{sendLabel(props.submitMode, submitting)}</button>
       <button className="command-button secondary" id="command-clear" type="button" onClick={() => { setValue(""); props.onClear(); }}>清空</button>
     </form>
   );
 }
+
+function sendLabel(submitMode: "turn" | "steer", submitting: boolean): string {
+  if (submitting) return submitMode === "steer" ? "引导中" : "发送中";
+  return submitMode === "steer" ? "引导" : "发送";
+}
+
+function steerTitle(submitMode: "turn" | "steer", targetTraceId: string | null): string | undefined {
+  if (submitMode !== "steer" || !targetTraceId) return undefined;
+  return `引导运行中的 turn: ${targetTraceId}`;
+}
diff --git a/web/hwlab-cloud-web/src/state/workbench-reducer.test.ts b/web/hwlab-cloud-web/src/state/workbench-reducer.test.ts
new file mode 100644
index 00000000..870dfd75
--- /dev/null
+++ b/web/hwlab-cloud-web/src/state/workbench-reducer.test.ts
@@ -0,0 +1,152 @@
+import assert from "node:assert/strict";
+import { test } from "bun:test";
+
+import { composerFromState, workbenchReducer } from "./workbench-reducer";
+import type { ChatMessage } from "../types/domain";
+import type { WorkbenchState } from "./workbench-state";
+
+test("composer stays unlocked and routes running turn input to steer", () => {
+  const state = baseState({
+    workspace: workspace("cnv_active", "trc_active"),
+    messages: [agentMessage({ conversationId: "cnv_active", traceId: "trc_active", status: "running" })],
+    chatPending: true
+  });
+
+  const composer = composerFromState(state, "cnv_active");
+
+  assert.equal(composer.disabled, false);
+  assert.equal(composer.submitMode, "steer");
+  assert.equal(composer.route, "/v1/agent/chat/steer");
+  assert.equal(composer.targetTraceId, "trc_active");
+  assert.equal(composer.conversationId, "cnv_active");
+});
+
+test("composer does not carry a running trace into another session", () => {
+  const state = baseState({
+    workspace: workspace("cnv_other", "trc_active"),
+    currentRequest: { traceId: "trc_active", conversationId: "cnv_active", sessionId: "ses_active", threadId: "thread_active", status: "running" },
+    messages: [agentMessage({ conversationId: "cnv_other", traceId: "trc_other_done", status: "completed" })],
+    chatPending: true
+  });
+
+  const composer = composerFromState(state, "cnv_other");
+
+  assert.equal(composer.disabled, false);
+  assert.equal(composer.submitMode, "turn");
+  assert.equal(composer.targetTraceId, null);
+});
+
+test("conversation selection scopes chatPending to the selected session messages", () => {
+  const state = baseState({
+    workspace: workspace("cnv_active", "trc_active"),
+    currentRequest: { traceId: "trc_active", conversationId: "cnv_active", sessionId: "ses_active", threadId: "thread_active", status: "running" },
+    messages: [agentMessage({ conversationId: "cnv_active", traceId: "trc_active", status: "running" })],
+    chatPending: true
+  });
+
+  const selected = workbenchReducer(state, {
+    type: "conversation:select",
+    conversation: {
+      conversationId: "cnv_done",
+      sessionId: "ses_done",
+      messages: [agentMessage({ conversationId: "cnv_done", traceId: "trc_done", status: "completed" })]
+    },
+    workspace: workspace("cnv_done", null)
+  });
+
+  assert.equal(selected.chatPending, false);
+  assert.equal(selected.currentRequest, null);
+  assert.equal(composerFromState(selected, "cnv_done").submitMode, "turn");
+});
+
+test("conversation selection restores steer mode when switching back to a running session", () => {
+  const state = baseState({ workspace: workspace("cnv_done", null), messages: [], chatPending: false });
+
+  const selected = workbenchReducer(state, {
+    type: "conversation:select",
+    conversation: {
+      conversationId: "cnv_active",
+      sessionId: "ses_active",
+      threadId: "thread_active",
+      messages: [agentMessage({ conversationId: "cnv_active", traceId: "trc_active", status: "running" })]
+    },
+    workspace: workspace("cnv_active", "trc_active")
+  });
+
+  const composer = composerFromState(selected, "cnv_active");
+  assert.equal(selected.chatPending, true);
+  assert.equal(composer.submitMode, "steer");
+  assert.equal(composer.targetTraceId, "trc_active");
+});
+
+test("composer routes to steer from workspace active status even before running message is restored", () => {
+  const state = baseState({
+    workspace: workspace("cnv_active", "trc_active"),
+    messages: [],
+    chatPending: false
+  });
+
+  const composer = composerFromState(state, "cnv_active");
+
+  assert.equal(composer.disabled, false);
+  assert.equal(composer.submitMode, "steer");
+  assert.equal(composer.targetTraceId, "trc_active");
+});
+
+test("composer disables only when no session or workspace exists", () => {
+  const composer = composerFromState(baseState({ workspace: null, messages: [] }), null);
+  assert.equal(composer.disabled, true);
+  assert.equal(composer.disabledReason, "session_required");
+  assert.equal(composer.submitMode, "turn");
+});
+
+function baseState(patch: Partial<WorkbenchState>): WorkbenchState {
+  return {
+    workspace: workspace("cnv_active", null),
+    conversations: [],
+    messages: [],
+    selectedDevicePodId: "device-pod-test",
+    providerProfile: "deepseek",
+    codeAgentTimeoutMs: 180_000,
+    gatewayShellTimeoutMs: 120_000,
+    live: null,
+    codeAgentAvailability: null,
+    loading: false,
+    chatPending: false,
+    currentRequest: null,
+    error: null,
+    ...patch
+  };
+}
+
+function workspace(selectedConversationId: string, activeTraceId: string | null): WorkbenchState["workspace"] {
+  return {
+    workspaceId: "wsp_test",
+    revision: 1,
+    selectedConversationId,
+    selectedAgentSessionId: "ses_test",
+    activeTraceId,
+    workspace: {
+      selectedConversationId,
+      selectedAgentSessionId: "ses_test",
+      threadId: "thread_test",
+      activeTraceId,
+      sessionStatus: activeTraceId ? "running" : "completed"
+    }
+  };
+}
+
+function agentMessage(input: { conversationId: string; traceId: string; status: ChatMessage["status"] }): ChatMessage {
+  return {
+    id: `msg_${input.traceId}`,
+    role: "agent",
+    title: "Code Agent",
+    text: "message",
+    status: input.status,
+    createdAt: "2026-06-04T00:00:00.000Z",
+    traceId: input.traceId,
+    conversationId: input.conversationId,
+    sessionId: input.conversationId.replace("cnv", "ses"),
+    threadId: input.conversationId.replace("cnv", "thread")
+  };
+}
diff --git a/web/hwlab-cloud-web/src/state/workbench-reducer.ts b/web/hwlab-cloud-web/src/state/workbench-reducer.ts
index 095cd2cc..0036755f 100644
--- a/web/hwlab-cloud-web/src/state/workbench-reducer.ts
+++ b/web/hwlab-cloud-web/src/state/workbench-reducer.ts
@@ -12,7 +12,7 @@ export type Action =
   | { type: "profile:set"; profile: WorkbenchState["providerProfile"] }
   | { type: "timeout:set"; codeAgentTimeoutMs: number }
   | { type: "gateway-timeout:set"; gatewayShellTimeoutMs: number }
-  | { type: "message:pending"; user: ChatMessage; pending: ChatMessage; request: WorkbenchState["currentRequest"] }
+  | { type: "message:pending"; user: ChatMessage; pending: ChatMessage; request: NonNullable<WorkbenchState["currentRequest"]> }
   | { type: "message:replace"; messageId: string; message: ChatMessage }
   | { type: "message:trace-status"; messageId: string; status: string }
   | { type: "message:trace"; messageId: string; trace: NonNullable<ChatMessage["runnerTrace"]> }
@@ -33,7 +33,7 @@ export function workbenchReducer(state: WorkbenchState, action: Action): Workben
     case "profile:set": return { ...state, providerProfile: action.profile };
     case "timeout:set": return { ...state, codeAgentTimeoutMs: action.codeAgentTimeoutMs };
     case "gateway-timeout:set": return { ...state, gatewayShellTimeoutMs: action.gatewayShellTimeoutMs };
-    case "message:pending": return { ...state, messages: [...state.messages, action.user, action.pending], chatPending: true, currentRequest: action.request };
+    case "message:pending": return { ...state, messages: [...state.messages, action.user, action.pending], chatPending: true, currentRequest: { ...action.request, status: "running" } };
     case "message:replace": return { ...state, messages: replaceMessage(state.messages, action.messageId, action.message) };
     case "message:trace-status": {
       const updated = state.messages.map((message) => message.id === action.messageId ? { ...message, traceReplayStatus: action.status, updatedAt: new Date().toISOString() } : message);
@@ -45,8 +45,11 @@ export function workbenchReducer(state: WorkbenchState, action: Action): Workben
     }
     case "message:complete": return { ...state, messages: replaceMessage(state.messages, action.messageId, action.message), codeAgentAvailability: action.availability ?? state.codeAgentAvailability, workspace: action.workspace ?? state.workspace };
     case "message:fail": return { ...state, messages: replaceMessage(state.messages, action.messageId, action.message) };
-    case "chat:done": return { ...state, chatPending: false, currentRequest: null };
-    case "conversation:select": return { ...state, workspace: action.workspace ?? state.workspace, messages: action.conversation?.messages ?? [], error: null };
+    case "chat:done": return { ...state, chatPending: false, currentRequest: state.currentRequest ? { ...state.currentRequest, status: "completed" } : null };
+    case "conversation:select": {
+      const messages = action.conversation?.messages ?? [];
+      return { ...state, workspace: action.workspace ?? state.workspace, messages, chatPending: hasRunningAgentMessage(messages), currentRequest: null, error: null };
+    }
     case "conversation:list": return { ...state, conversations: action.conversations };
     case "conversation:clear": return { ...state, messages: [], currentRequest: null, chatPending: false };
     default: return state;
@@ -58,16 +61,56 @@ function replaceMessage(messages: ChatMessage[], messageId: string, replacement:
 }
 
 export function composerFromState(state: WorkbenchState, activeConversationId: string | null): ComposerState {
-  const activeTraceId = firstNonEmptyString(state.currentRequest?.traceId, state.workspace?.activeTraceId, state.workspace?.workspace?.activeTraceId);
-  const sessionStatus = firstNonEmptyString(state.messages.at(-1)?.status, state.workspace?.workspace?.sessionStatus);
-  const canSteer = Boolean(activeTraceId && state.chatPending && sessionStatus !== "completed" && sessionStatus !== "failed");
+  const latestMessage = latestConversationMessage(state.messages, activeConversationId);
+  const runningMessage = findRunningAgentMessage(state.messages, activeConversationId);
+  const currentRequestInConversation = state.currentRequest && state.currentRequest.conversationId === activeConversationId ? state.currentRequest : null;
+  const activeTraceId = firstNonEmptyString(currentRequestInConversation?.traceId, runningMessage?.traceId, runningMessage?.runnerTrace?.traceId, state.workspace?.activeTraceId, state.workspace?.workspace?.activeTraceId);
+  const workspaceStatus = firstNonEmptyString(state.workspace?.workspace?.sessionStatus);
+  const sessionStatus = firstNonEmptyString(runningMessage?.status, currentRequestInConversation?.status, latestMessage?.status, workspaceStatus);
+  const latestTerminal = isTerminalStatus(latestMessage?.status);
+  const terminal = latestTerminal || isTerminalStatus(currentRequestInConversation?.status) || (!latestMessage && isTerminalStatus(workspaceStatus));
+  const activeByStatus = isActiveStatus(runningMessage?.status) || isActiveStatus(runningMessage?.runnerTrace?.status) || isActiveStatus(currentRequestInConversation?.status) || isActiveStatus(workspaceStatus) || state.chatPending;
+  const canSteer = Boolean(activeConversationId && activeTraceId && !terminal && activeByStatus);
+  const conversationId = activeConversationId;
+  const sessionId = firstNonEmptyString(runningMessage?.sessionId, currentRequestInConversation?.sessionId, state.workspace?.selectedAgentSessionId, state.workspace?.workspace?.selectedAgentSessionId);
+  const threadId = firstNonEmptyString(runningMessage?.threadId, currentRequestInConversation?.threadId, state.workspace?.workspace?.threadId);
   if (canSteer) {
-    return { disabled: false, disabledReason: null, submitMode: "steer", route: "/v1/agent/chat/steer", targetTraceId: activeTraceId };
+    return { disabled: false, disabledReason: null, submitMode: "steer", route: "/v1/agent/chat/steer", targetTraceId: activeTraceId, conversationId, sessionId, threadId };
   }
   if (!activeConversationId && !state.workspace?.workspaceId) {
-    return { disabled: true, disabledReason: "session_required", submitMode: "turn", route: "/v1/agent/chat", targetTraceId: null };
+    return { disabled: true, disabledReason: "session_required", submitMode: "turn", route: "/v1/agent/chat", targetTraceId: null, conversationId, sessionId, threadId };
   }
-  return { disabled: false, disabledReason: null, submitMode: "turn", route: "/v1/agent/chat", targetTraceId: null };
+  return { disabled: false, disabledReason: null, submitMode: "turn", route: "/v1/agent/chat", targetTraceId: null, conversationId, sessionId, threadId };
+}
+
+function findRunningAgentMessage(messages: ChatMessage[], activeConversationId: string | null): ChatMessage | null {
+  for (const message of [...messages].reverse()) {
+    if (message.role !== "agent") continue;
+    if (message.status !== "running" && message.runnerTrace?.status !== "running") continue;
+    if (activeConversationId && message.conversationId && message.conversationId !== activeConversationId) continue;
+    return message;
+  }
+  return null;
+}
+
+function latestConversationMessage(messages: ChatMessage[], activeConversationId: string | null): ChatMessage | null {
+  for (const message of [...messages].reverse()) {
+    if (activeConversationId && message.conversationId && message.conversationId !== activeConversationId) continue;
+    return message;
+  }
+  return null;
+}
+
+function hasRunningAgentMessage(messages: ChatMessage[]): boolean {
+  return Boolean(findRunningAgentMessage(messages, null));
+}
+
+function isActiveStatus(value: unknown): boolean {
+  return ["running", "pending", "accepted", "processing"].includes(String(value ?? "").trim().toLowerCase());
+}
+
+function isTerminalStatus(value: unknown): boolean {
+  return ["completed", "failed", "blocked", "timeout", "canceled", "cancelled"].includes(String(value ?? "").trim().toLowerCase());
 }
 
 export function availabilityFromLive(live: LiveSurface): CodeAgentAvailability | null {
diff --git a/web/hwlab-cloud-web/src/state/workbench-state.ts b/web/hwlab-cloud-web/src/state/workbench-state.ts
index ce14313d..48e7a2d6 100644
--- a/web/hwlab-cloud-web/src/state/workbench-state.ts
+++ b/web/hwlab-cloud-web/src/state/workbench-state.ts
@@ -14,7 +14,7 @@ export interface WorkbenchState {
   codeAgentAvailability: CodeAgentAvailability | null;
   loading: boolean;
   chatPending: boolean;
-  currentRequest: { traceId: string; conversationId: string; sessionId: string | null; threadId: string | null } | null;
+  currentRequest: { traceId: string; conversationId: string; sessionId: string | null; threadId: string | null; status?: "running" | "completed" } | null;
   error: string | null;
 }
 
@@ -24,6 +24,9 @@ export interface ComposerState {
   submitMode: "turn" | "steer";
   route: "/v1/agent/chat" | "/v1/agent/chat/steer";
   targetTraceId: string | null;
+  conversationId: string | null;
+  sessionId: string | null;
+  threadId: string | null;
 }
 
 export interface WorkbenchRuntimeContext {
diff --git a/web/hwlab-cloud-web/src/state/workbench.ts b/web/hwlab-cloud-web/src/state/workbench.ts
index fe9d3dd2..96968074 100644
--- a/web/hwlab-cloud-web/src/state/workbench.ts
+++ b/web/hwlab-cloud-web/src/state/workbench.ts
@@ -229,15 +229,17 @@ export function useWorkbenchStore(enabled: boolean): WorkbenchStore {
   const submitMessage = useCallback(async (text: string) => {
     const value = text.trim();
     if (!value) return;
-    const traceId = nextProtocolId("trc");
-    const conversationId = activeConversationId ?? nextProtocolId("cnv");
-    const sessionId = state.workspace?.selectedAgentSessionId ?? state.workspace?.workspace?.selectedAgentSessionId ?? null;
-    const threadId = state.workspace?.workspace?.threadId ?? null;
+    const steerMode = composer.submitMode === "steer";
+    const traceId = steerMode && composer.targetTraceId ? composer.targetTraceId : nextProtocolId("trc");
+    const steerTraceId = steerMode ? nextProtocolId("trc_steer") : null;
+    const conversationId = composer.conversationId ?? activeConversationId ?? nextProtocolId("cnv");
+    const sessionId = composer.sessionId ?? state.workspace?.selectedAgentSessionId ?? state.workspace?.workspace?.selectedAgentSessionId ?? null;
+    const threadId = composer.threadId ?? state.workspace?.workspace?.threadId ?? null;
     const user = makeMessage("user", value, "sent", { traceId, conversationId, sessionId, threadId });
     const pending = makeMessage("agent", "正在处理这次 Code Agent 请求；复杂问题可能需要几分钟。", "running", { traceId, conversationId, sessionId, threadId, title: "Code Agent 处理中" });
     const pendingWithRetry: ChatMessage = { ...pending, retryInput: value };
     dispatch({ type: "message:pending", user, pending: pendingWithRetry, request: { traceId, conversationId, sessionId, threadId } });
-    const route = composer.submitMode === "steer" ? api.steerAgentMessage : api.sendAgentMessage;
+    const route = steerMode ? api.steerAgentMessage : api.sendAgentMessage;
     // The submit call itself is a "kicked off" event; treat it as activity
     // so the initial POST has a fresh inactivity window.
     updateActivity();
@@ -254,7 +256,8 @@ export function useWorkbenchStore(enabled: boolean): WorkbenchStore {
       gatewayShellTimeoutMs: state.gatewayShellTimeoutMs,
       workspaceId: state.workspace?.workspaceId,
       workspaceRevision: state.workspace?.revision,
-      targetTraceId: composer.targetTraceId
+      targetTraceId: steerMode ? traceId : null,
+      steerTraceId
     }, state.codeAgentTimeoutMs, submitActivityRef);
     const finalize = async (result: AgentChatResultResponse, availability: CodeAgentAvailability | null): Promise<void> => {
       const completed = messageFromAgentResponse(pending.id, pending, result);
@@ -287,7 +290,7 @@ export function useWorkbenchStore(enabled: boolean): WorkbenchStore {
       dispatch({ type: "message:fail", messageId: pending.id, message: failed });
     }
     dispatch({ type: "chat:done" });
-  }, [activeConversationId, composer.submitMode, composer.targetTraceId, state.codeAgentTimeoutMs, state.gatewayShellTimeoutMs, state.messages, state.providerProfile, state.workspace]);
+  }, [activeConversationId, composer.conversationId, composer.sessionId, composer.submitMode, composer.targetTraceId, composer.threadId, state.codeAgentTimeoutMs, state.gatewayShellTimeoutMs, state.messages, state.providerProfile, state.workspace]);
 
   const cancelAgentMessage = useCallback(async (messageId: string) => {
     return cancelAgentMessageAction(messageId, {